I assume you’re talking about the remake. I actually find the “running zombies” less terrifying than the shambling ones in the original movie. I always felt that the shambling ones were scary because they seemed easy to beat. So most people would give them a shove and keep doing whatever until finally they get over confident and get swarmed.

I felt our zombies had to kick it up a notch, being in space and all. Plus I always felt it was weird that zombies didn’t have at least some of the life knowledge at their disposal. More creepy stuff coming!